get Bitmap By Size - Android Graphics

Android examples for Graphics:Bitmap Size

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Description

get Bitmap By Size

Demo Code


//package com.java2s;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;

public class Main {
    public static Bitmap getBitmapBySize(String path, int width, int height) {
        BitmapFactory.Options opts = new Options();
        opts.inJustDecodeBounds = true;//from w ww . j a v  a 2  s. co m
        BitmapFactory.decodeFile(path, opts);
        opts.inSampleSize = computeSampleSize(opts, -1, width * height);
        opts.inJustDecodeBounds = false;
        Bitmap bm = BitmapFactory.decodeFile(path, opts);
        return bm;
    }

    private static int computeSampleSize(Options opts, int minSideLength,
            int maxNumOfPixels) {
        int initialSize = computeInitialSampleSize(opts, minSideLength,
                maxNumOfPixels);
        int roundedSize;
        if (initialSize <= 8) {
            roundedSize = 1;
            while (roundedSize < initialSize) {
                roundedSize <<= 1;
            }
        } else {
            roundedSize = (initialSize + 7) / 8 * 8;
        }
        return roundedSize;
    }

    private static int computeInitialSampleSize(Options opts,
            int minSideLength, int maxNumOfPixels) {
        double w = opts.outWidth;
        double h = opts.outHeight;
        int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(w * h
                / maxNumOfPixels);
        int upperBound = (minSideLength == -1) ? 128 : (int) Math.min(
                Math.floor(w / minSideLength),
                Math.floor(h / minSideLength));
        if (upperBound < lowerBound) {
            return lowerBound;
        }
        if ((maxNumOfPixels == -1) && (minSideLength == -1)) {
            return 1;
        } else if (minSideLength == -1) {
            return lowerBound;
        } else {
            return upperBound;
        }
    }
}

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